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以塔里木河中游植物群落中的建群种多枝柽柳为研究对象,研究地下生物量现状、地下生物量空间分布格局及地下与地上生物量的相关性。研究结果表明,柽柳总生物量约为28.06 kg/m2,约19.7%分布在地上部分,为5.53 kg/m2;根系生物量占80.3%,大约为22.53 kg/m2。柽柳群落的地下生物量与土壤深度负相关,即随土层深度的增加而减小。地下生物量的峰值分布于0～40 cm,约为根系总生物量的38.7%。该研究区柽柳地下与地上生物量回归方程:y=-0.249x2+6.624x-1.356,R2=0.674。可见,地上生物量可解释地下生物量变化的67.4%。在涉及不同研究区域或不同空间尺度的研究时,还需要大量的实测生物量数据对方程进行重新拟合。
The objective of this study was to investigate the status of underground biomass, the spatial distribution pattern of underground biomass and the correlation between underground and aboveground biomass in the Tazhumei community in the middle reaches of the Tarim River. The results showed that the total biomass of Tamarix chinensis was about 28.06 kg / m2, about 19.7% of the total biomass was 5.53 kg / m2 and the root biomass was 80.3%, about 22.53 kg / m2. The underground biomass of Tamarix chinensis community is negatively correlated with soil depth, ie, it decreases with the depth of soil layer. The peak values of underground biomass ranged from 0 to 40 cm, accounting for 38.7% of the total root biomass. The regression equation of underground and aboveground biomass in Tamarix chinensis: y = -0.249x2 + 6.624x-1.356, R2 = 0.674. It can be seen that the above-ground biomass explained 67.4% of the variation of the underground biomass. In studies involving different study areas or different spatial scales, a large amount of measured biomass data is also needed to re-fit the equation.